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首页> 外文期刊>Environmental Science & Technology >High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances
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High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances

机译：暴露于光和湿气物质的银纳米颗粒的高分辨率STEM-EELS研究

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摘要

Nanoparticles (NPs) are defined as particles with at least one dimension between 1 and 100 run or with properties that differ from their bulk material, which possess unique properties. The extensive use of NPs means that discharge to the environment is likely increasing, but fate, behavior, and effects under environmentally relevant conditions are insufficiently studied. This paper focuses on the transformations of silver nanoparticles (AgNPs) under simulated but realistic environmental conditions. High resolution aberration-corrected scanning transmission electron microscopy (HAADF STEM) coupled with electron energy loss spectroscopy (EELS) and UV-vis were used within a multimethod approach to study morphology, surface chemistry transformations, and corona formation. Although loss, most likely by dissolution, was observed, there was no direct evidence of oxidation from the STEM-EELS. However, in the presence of fulvic acid (FA), a 1.3 nm oxygen-containing corona was observed around the AgNPs in water; modeled data based on the HAADF signal at near atomic resolution suggest this was an FA corona was formed and was not silver oxide, which was coherent (Le., fully coated in FA), where observed. The corona further colloidally stabilized the NPs for periods of weeks to months, dependent on the solution conditions.
机译：纳米粒子（NPs）定义为至少一个尺寸介于1到100纳米之间或具有不同于其块状材料的特性的粒子，这些粒子具有独特的特性。 NP的广泛使用意味着向环境的排放可能会增加，但是对与环境有关的条件下的命运，行为和影响的研究还不够充分。本文着重于模拟但现实的环境条件下银纳米颗粒（AgNPs）的转变。高分辨率像差校正扫描透射电子显微镜（HAADF STEM）结合电子能量损失谱（EELS）和紫外线可见光用于多方法研究形态，表面化学转化和电晕形成的方法。尽管观察到很可能是溶解引起的损失，但没有直接证据表明STEM-EELS会氧化。然而，在富里酸（FA）存在下，在水中的AgNPs周围观察到1.3 nm的含氧电晕；在接近原子分辨率的情况下，基于HAADF信号的模型数据表明，这是形成了FA电晕，而不是氧化银，这是相干的（例如，在FA中完全涂覆），在观察到。电晕进一步使NP胶体稳定数周至数月，具体取决于溶液条件。

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  • 来源
    《Environmental Science & Technology》 |2016年第5期|2183-2190|共8页
  • 作者

    Isabella Roemer; Zhi Wei Wang; Ruth C. Merrifield; Richard E. Palmer; Jamie Lead;

  • 作者单位

    School of Geography Earth and Environmental Sciences, University of Birmingham, Edghaston, Birmingham B15 2TT, United Kingdom;

    Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom,Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China;

    Center for Environmental Nanoscience and Risk (CENR), Arnold School of Public Health, University of South Carolina, Columbia, South Carolina 29208, United States;

    Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom;

    School of Geography Earth and Environmental Sciences, University of Birmingham, Edghaston, Birmingham B15 2TT, United Kingdom,Center for Environmental Nanoscience and Risk (CENR), Arnold School of Public Health, University of South Carolina, Columbia, South Carolina 29208, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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